<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-row>
      <el-col>
        <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
      </el-col>
    </el-row>

    <!-- 表格  https://github.com/MisterTaki/vue-table-with-tree-grid-->
    <tree-table class="treeTable" show-index index-text="#" border :show-row-hover="false" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false">
      <!-- 是否有效 -->
      <template slot="isok" slot-scope="scope">
        <i v-if="scope.row.cat_deleted === false" class="el-icon-success" style="color:lightgreen;"></i>
        <i v-else class="el-icon-error" style="color:red;"></i>
      </template>

      <!-- 排序 -->
      <template slot="order" slot-scope="scope">
        <el-tag v-if="scope.row.cat_level === 0" size="mini">一级</el-tag>
        <el-tag v-else-if="scope.row.cat_level === 1" type="success" size="mini">二级</el-tag>
        <el-tag v-else type="warning" size="mini">三级</el-tag>
      </template>

      <!-- 操作 -->
      <template slot="opt">
        <el-button type="primary" icon="el-icon-edit">编辑</el-button>
        <el-button type="danger" icon="el-icon-delete">删除</el-button>
      </template>
    </tree-table>

    <!-- 分页 -->
    <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum" :page-sizes="[3, 5, 10, 15]" :page-size="queryInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total"></el-pagination>
    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="70px">
        <el-form-item label="分类名称：" prop="cat_name" label-width="100px">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：" label-width="100px">
          <!-- options 用来指定数据源  props指定配置对象  :props="{ expandTrigger: 'hover' }" -->
          <el-cascader
            filterable
            :options="parentCateList"
            :props="{
              value: 'cat_id',
              label: 'cat_name',
              children: 'children',
              expandTrigger: 'hover',
              checkStrictly: true
            }"
            v-model="selectedKeys"
            @change="parentCateChanged"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      catelist: [],
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        //默认0
        cat_pid: 0,
        //默认一级分类
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }]
      },
      //父级分类列表
      parentCateList: [],
      selectedKeys: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')
      this.catelist = res.data.result
      this.total = res.data.total
      //console.log(this.catelist);
    },
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newSize) {
      this.queryInfo.pagenum = newSize
      this.getCateList()
    },
    showAddCateDialog() {
      this.getParentCateList()

      this.addCateDialogVisible = true
    },
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取目录数据失败！')
      }
      this.parentCateList = res.data
    },
    //选择项变化触发的函数
    parentCateChanged() {
      // console.log(this.selectedKeys)
      //如果selectedKeys数据length>0 证明选中了分类
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        // console.log(this.addCateForm)
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
        // console.log(this.addCateForm)
      }
      return
    },
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error(res.meta.msg)
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible = false
      })
      // this.$refs.addCateFormRef.resetFields() 这句加这里this.addCateForm 值都空了！
      this.selectedKeys = []
      this.addCateForm = {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      }
    }
  }
}
</script>
<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>
